package com.weichen.delivery.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.weichen.delivery.common.CustomException;
import com.weichen.delivery.dto.SetmealDto;
import com.weichen.delivery.entity.Setmeal;
import com.weichen.delivery.entity.SetmealDish;
import com.weichen.delivery.mapper.SetmealMapper;
import com.weichen.delivery.service.SetmealDishService;
import com.weichen.delivery.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

//    新增套餐，同时保存套餐与菜品之间的关联关系
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
//        保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
//        保存套餐和菜品的关联信息，操作setmeal_dish，执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

//    删除套餐，同时删除套餐与菜品之间的关联关系
    @Transactional
    public void removeWithDish(List<Long> ids) {
//        select count(*) from setmeal where id in (1,2,3) and status = 1
//        查询套餐状态，确定是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);//查id用in
        queryWrapper.eq(Setmeal::getStatus,1);//status=1表示套餐正在售卖，不可以删除
        int count = this.count(queryWrapper);
//        如果不能删除，抛出一个业务异常
        if (count > 0){
            throw new CustomException("套餐正在售卖，不可以删除!");
        }
//        如果可以删除。先删除套餐表中的数据----seteam
        this.removeByIds(ids);
//        删除关系表中的数据----seteam_dish
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
        setmealDishService.remove(lambdaQueryWrapper);
    }
}
